If you don't have an Autodiscover record in place, Outlook will generally be unable to find your mailbox settings to configure your account. If you use Outlook 2013, you can manually add the settings to connect to your account. This will not work for Outlook 2016 or later, as the option to manually set an account up was removed with this version.
Configure Outlook Manually
Click the Start logo and then click Control Panel.
Note: This may show as 'Mail (32-bit)'
Note: If you don't see this option, try search for it in the upper right corner
Select Show Profiles...
Give your profile a name
Note: This can be anything that will allow you to easily reference the account. It must be unique in the list of profiles. Once you are happy with the name click OK.
Select Manually Configure Server Settings or additional Server Types
Select Microsoft Exchange or Compatible Service
Enter the Exchange Server as THHSTE15D1BE1.hs20.net
Enter the username as your login (usually your full email address)
Click on More Settings
Select the Connection tab
Tick Connect to Microsoft Exchange using HTTP
Select Exchange Proxy settings...
Enter the Proxy Server as outlook.hs20.net
Enter the Principal Name as MSSTD:outlook.hs20.net
Tick On fast networks, connect using HTTP first, then connect using TCP/IP
Change the Authentication to Basic Authentication.
Select OK again
Click Check Name
Enter your email address and password if prompted.